Electric lamp



J. CATHRILL.

ELECTRIC LAMP.

APPLICATION FILED FEB. 13, 1919.

Patented J 11116 15, 1920.

INVENTOR. ae/Y (Zzzir'z'll;

sears rs ear air seas JACK CATHRILL, OF LOS ANGELES, CALIFORNIA, ASSIGNOR OF ONE-HALF TO LIBBIE R. FENN, OF LOS ANGELES, CALIFORNIA.

. 'ELEC-TRIC LAMP.

Specification of Letters Patent. Pate t d J 15 1924 Application filed February 13, 1919. Serial No. 276,821.

adapted to be illuminated by a pocket bat- Y tery or the like and which is especially applicable for use as a miners lamp but which may be employed for the various purposes to which a miniature lamp may be put.

It is the object of this invention to provide an electric lamp which is extremely light in weight and small in size embodying a casing fitted with means whereby the lamp may be worn on belt, hat band, wrist band, or

other means of support carried by the person, or connected to a bracket or standard or other suitable structure when it is desired to employ the lamp as a fixture.

Another object is to provide the lamp with a reflector embodied in the lamp casing and to equip the casing with a demountable and adjustable shield having a reflecting surface arranged to cooperate with the reflector on the casing in directing light rays from an incandescent light bulb positioned in front of the reflector.

Another object is to provide a lamp of the above character consisting of few parts adapted to be readily assembled.

Other objects will appear hereinafter.

The invention is illustrated in the accompanying drawing in which:

Figure 1 is a perspective new of the lamp as seen from the rear portion thereof.

Fig. 2 is a view in perspective of the back plate.

Fig. 3 is a perspective view of the socket and insulating block.

Fig. 4: is a perspective View of the combned cap andreflector.

Fig. 5 is a perspective view of the meandescent light bulb.

Fig. 6 is a view of the lamp as seen in vertical section and elevation illustrating the manner of assembling same.

More specifically 8 indicates the back plate which is here shown as circular in form, substantially flat and formed with a narrow inturned marginal flange 9. Formed on one edge of the back plate and integral therewith, is a spring arm 10 which is bent adjacent to its juncture with the plate and disposed alongside'the rear face of the plate to form with the latter a spring clamp by means of which the plate may be readily attached to or removed from any suitable sup-- port. This back plate constitutes the supporting element of the lamp.

An insulating block 11 is secured on the front face of the back plate by bolts 12 or other suitable fastenings which block carries a socket 13 adapted to receive the base portion 14- of an electric light bulb 15; a pair of binding posts 16 and 17 connecting with contacts in the socket adapted to complete electr cal connection with the filament of the electric lamp as is common in electric lamp and socket construction.

18 indicates a cap having a cylindrical side wall 19 and a concave end wall 20 formed with a central opening 21. The wall 19 is adapted to encircle the flange 9 on the back plate and to be secured to the latter by means of detents 22 formed in the cap engageable with indents 23 formed on spring ears 24 projecting outwardly from the flange 9. The cap when attached to the back plate incloses the socket and insulating block with the margin of the opening 21 encircling the open end of the socket. The electric light bulb is put in place after the cap has been attached tothe back plate by inserting the base thereof into the socket through the opening in the cap. and when in position in the socket the bulb will be disposed immediately in front of the concave end of the cap. The concave end of the cap is either polished or plated and constitutes a be frictionally engaged by a grooved flange 27 formed on a sleeve 28 adapted to slip over the outer end of the cap; the flange 27 being formed with a slit 29 to allow it to pass over the rib. Formed on the sleeve to project forward of the cap is a shield 30 which is preferably semispherical in shape and formed with a reflective inner surface adapted to cooperate with a concave reflector surface on the cap in reflecting light rays from the lamp. Electrical conductors 31 and 32 pass through an insulating collar on the front of the insulating block; the

opening in the cap side wall being formed between the rib 26 and the rear edge of the cap and at such joint as to be disposed in front of the insulating block when the cap is engaged with the back plate.

In assembling the lamp the insulating block carrying the socket is placed on the face of the back plate and engaged therewith by the bolts which are passed through openings in the back plate with their heads disposed on the outer face thereof and are inserted through openings in the insulating block. Nuts screwed on the'threaded ends of the bolts bear against the front face of the insulating block and clamp the latter in position. The terminals of the electric conductors are then passed through the collar on the cap andsecured to the binding posts on the insulating block. The cap and back plate are then connected together by inserting the spring tongues on the back plate within the cap to bring the detents and indents into engagement. The light bulb may then be put in place and removed as desired without separating the back plate and cap. The sleeve carrying the shield is slipped 'over the outer end of the cap and the grooved flange thereon is sprung into fric tional engagement with the rib on the cap, thus mounting the shield so that it may be turned to various positions on the cap without disengagement therefrom.

1. An electric lamp comprising a back plate formed with a marginal flange, a spring arm on said back plate cooperating therewith to form a spring clamp, a cap having side walls engaging the flangeon the back plate and having a concave end wall constituting a reflector and formed with a central opening, a lamp socket in said cap carried by the back plate, an incandescent light bulb held in said socket and arranged immediately in front of the concave end wall of the cap, a sleeve on said cap, and a shield carried by said sleeve projecting forward of the concave end of the cap.

2. 'In an electric lamp, a back plate hav- I 7 by said back plate, said bulb cooperating with its mounting to prevent separation of the cap and back plate when the bulb is engaged with its mounting.

3. In an electric lamp, a back plate formed with a marginal flange, a metallic cap having cylindrical side walls surrounding the flange on the back plate and formed with a concave end wall constituting a reflector which end Wallis formed with a central opening, a cylindrical sleeve adapted to telescope said cap in frictional engagement therewith, a shield formed on said sleeve projecting forward of,}*the concave end of the cap and an electric lighting element carried by the back plate and engaging said cap.

JACK OATHRILL. 

